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ok im going crazy this truck randomly will shift mint randomly will like nuetral and slam when it shifts i started by just cleaning connections on neutral switch and vss seemed ok for 20 miles then back to the same crap so i put new neutral switch and vss same thing about a day it was fine then back so i did another vss didnt fix it i cleaned all the computer connections nothing i did filter and fluid same thing but sometimes it shifts fine it randomly doesnt and does idk its a e40d i ran codes it has a 331 and 632 code im out of ideas the speedo randomly shuts off but doesnt seem to effect shifting the tachs also screwed up it idles on the tach at 3k rpms but it idles low and rough im out of ideas
Your speedo not working is most likely where your problem lies. Im not sure if it would be your speed sensor or the one on the rear diff. I dont know enough about e4ods but i do know that they need the speed input or they will shift crazily. Does the overdrive light ever blink on and off?
Code 632 is a KOER only, indicates the Transmission Control Switch (TCS) was not cycled between engine "ID Code" and the "Goose Test" in Key On Engine Running Self-Test. This is typically a user induced error. Could indicate a problem with the TCS button if you did push the button but nothing happened.